A null experimental test of the Newtonian inverse-square law at submillimeter range using a torsion pendulum was presented. Under the dual modulations of both the expected signal and the gravitational torque for calibration, our data concluded with 95% confidence that no new forces were observed and any gravitational-strength Yukawa forces (|α|≥1) must have a length scale λ<66 μm, agreeing well with the latest result of the E\"ot-wash group. Our result sets a unification energy scale of M*≥2.8 TeV/c² for the two compactified extra space dimensions with the same size R*<47 μm.
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Tu et al. (2007) studied this question.
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